Delete specific rows in a multidimensional matrix

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David Ponce
David Ponce 2018-10-23
编辑： James Tursa 2018-10-24
Hello, I have a problem with deleting rows in my multidimensional matrix. The thing is that I have a matrix A 800X1X100 with angles and i have to delete the rows that meet the condition. Here is my code:
for k=1:1:100
if(or(Z(k,1,:)>=230,Z(k,1,:)<=330))
Z(k,1,:) = [];
end
end
here is the error: A null assignment can have only one non-colon index.
Thank you.

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回答（1 个）

gonzalo Mier
gonzalo Mier 2018-10-24
The solution for your problem could be:
Z=rand(800,1,100)*400;
for(k=800:-1:1)
if(or(Z(k,1,:)>=230,Z(k,1,:)<=330))
Z((k-1)*100+(1:100)) = [];
Z = reshape(Z,[],1,100)
end
end
or use the squeeze function to make Z shape [800,100]
  1 个评论
David Ponce
David Ponce 2018-10-24
编辑：David Ponce 2018-10-24
Thanks for the answer, but now I know the problem, the thing is that I have to reshape my multidimensional matrix as I go deleting the rows. I have this:
for m=1:1:size(Z,3)
for n=1:1:size(Z,1)
if(and(Z(n,1,m)>=230 , Z(n,1,m)<=330))
Z(n,1,m) = []; %here is the problem i have to reshape
end
end
end

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